Neil Heslin, father of six-year-old Sandy Hook Elementary School shooting victim Jesse Lewis, wipes tears as he testifies during a hearing before the Senate Judiciary Committee February 27, 2013 on Capitol Hill in Washington, DC. The committee held a hearing on The Assault Weapons Ban of 2013.

Donna Soto, mother of Sandy Hook Elementary shooting victim first-grade teacher Victoria Soto, holds a picture of Victoria as she listens during a hearing before the Senate Judiciary Committee February 27, 2013 on Capitol Hill in Washington, DC. The committee held a hearing on The Assault Weapons Ban of 2013.

U.S. attorney of the District of Colorado John Walsh testifies during a hearing before the Senate Judiciary Committee February 27, 2013 on Capitol Hill in Washington, DC. The committee held a hearing on The Assault Weapons Ban of 2013.

U.S. attorney of the District of Colorado John Walsh testifies...

U.S. attorney of the District of Colorado John Walsh testifies... Photo-4258167.57548 - SFGate

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U.S. attorney of the District of Colorado John Walsh (L) and Chief of the Milwaukee Police Department Edward Flynn (R) testify during a hearing before the Senate Judiciary Committee February 27, 2013 on Capitol Hill in Washington, DC. The committee held a hearing on The Assault Weapons Ban of 2013.

U.S. attorney of the District of Colorado John Walsh (L) and Chief...

U.S. attorney of the District of Colorado John Walsh (L) and Chief... Photo-4258169.57548 - SFGate

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Chief of the Milwaukee Police Department Edward Flynn testifies during a hearing before the Senate Judiciary Committee February 27, 2013 on Capitol Hill in Washington, DC. The committee held a hearing on The Assault Weapons Ban of 2013.

U.S. Attorney of the District of Colorado John Walsh (R) waits for the beginning of a hearing before the Senate Judiciary Committee February 27, 2013 on Capitol Hill in Washington, DC. The committee held a hearing on The Assault Weapons Ban of 2013.

U.S. Attorney of the District of Colorado John Walsh (R) waits for...

U.S. Attorney of the District of Colorado John Walsh (R) waits for... Photo-4258171.57548 - SFGate

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U.S. Sen. Richard Blumenthal (D-CT) (R) greets Newtown, Connecticut, middle school teachers Mary Connolly (L) and Lil Martenson (2nd L) prior to hearing before the Senate Judiciary Committee February 27, 2013 on Capitol Hill in Washington, DC. The committee held a hearing on The Assault Weapons Ban of 2013.

Neil Heslin, father of six-year-old Sandy Hook Elementary School shooting victim Jesse Lewis, holds a picture of him with Jesse as he testifies during a hearing before the Senate Judiciary Committee February 27, 2013 on Capitol Hill in Washington, DC. The committee held a hearing on The Assault Weapons Ban of 2013.

EMS medical director of the Western Connecticut Health Network William Begg (R), and Neil Heslin (L), father of six-year-old Sandy Hook Elementary School shooting victim Jesse Lewis, testify during a hearing before the Senate Judiciary Committee February 27, 2013 on Capitol Hill in Washington, DC. The committee held a hearing on The Assault Weapons Ban of 2013.

Mayor of Philadelphia and president of the U.S. Conference of Mayors Michael Nutter (R) talks to family of Sandy Hook Elementary shooting victim first-grade teacher Victoria Soto, sisters Carlee (L) and Jillian (2nd L), mother Donna (3rd L) and father Carlos (4th L) after a hearing before the Senate Judiciary Committee February 27, 2013 on Capitol Hill in Washington, DC. The committee held a hearing on The Assault Weapons Ban of 2013.

Mayor of Philadelphia and president of the U.S. Conference of...

Mayor of Philadelphia and president of the U.S. Conference of... Photo-4258176.57548 - SFGate

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Mayor of Philadelphia and president of the U.S. Conference of Mayors Michael Nutter leaves after a hearing before the Senate Judiciary Committee February 27, 2013 on Capitol Hill in Washington, DC. The committee held a hearing on The Assault Weapons Ban of 2013.

Mayor of Philadelphia and president of the U.S. Conference of...

Mayor of Philadelphia and president of the U.S. Conference of... Photo-4258177.57548 - SFGate